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Technology for extracting lignin from residues of pectin extraction from orange peel

A lignin and citrus peel technology, applied in the field of lignin extraction, can solve the problems of polluting the environment and wasting resources, and achieve the effect of increasing output value and avoiding waste

Inactive Publication Date: 2017-04-19
ANHUI YUNING PECTIN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, when most enterprises use citrus peels to extract pectin, they perform water washing, acid water extraction, and liquid slag separation. The obtained slag is dried and crushed to obtain pectin. The separated separation liquid is directly discarded as waste, but the separation liquid It contains lignin, cellulose, etc., and it is directly discarded, which pollutes the environment and wastes resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A process for extracting lignin from the residue after extracting pectin from citrus peels, comprising the following steps:

[0020] (1) Distillation: Distill the residue of the separation liquid after extracting pectin from the citrus peel at 80°C and 10kPa for 4 hours to separate the organic solvent and water to obtain a concentrate;

[0021] (2) adjust the pH value: add hydrochloric acid in the concentrated solution of step (1) and adjust the pH value to be 2;

[0022] (3) Anaerobic adjustment: add cellulase to the concentrated solution of step (2), seal and keep warm at 30° C. for 2 hours, filter, wash several times with clear water to obtain pomace;

[0023] (4) Aerobic adjustment: add sodium hydroxide solution 2 times its weight to the pomace obtained in step (3), stir for 30 minutes, filter, add hydrogen peroxide solution 1 times its weight for the filter residue, stir 30 minutes, filter, pomace;

[0024] (5) Flocculation: adding a flocculant to the pomace obta...

Embodiment 2

[0028] A process for extracting lignin from the residue after extracting pectin from citrus peels, comprising the following steps:

[0029] (1) Distillation: Distill the residue of the separation liquid after extracting pectin from the citrus peel at 100° C. and 20 kPa for 2 hours to separate the organic solvent and water to obtain a concentrate;

[0030] (2) adjust the pH value: add hydrochloric acid in the concentrated solution of step (1) and adjust the pH value to be 3;

[0031] (3) Anaerobic adjustment: add cellulase to the concentrated solution of step (2), seal and keep warm at 40°C for 1 hour, filter, wash several times with clear water, and obtain pomace;

[0032] (4) Aerobic regulation: add sodium hydroxide solution 3 times of its weight to the pomace that step (3) obtains, stir 20 minutes, filter, filter residue adds hydrogen peroxide solution 2 times of its weight, stir 20 minutes, filter, pomace;

[0033] (5) Flocculation: adding a flocculant to the pomace obtai...

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PUM

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Abstract

The invention discloses a technology for extracting lignin from residues of pectin extraction from orange peel. The technology comprises the following steps: distilling separating medium residue obtained after pectin extraction from orange peel, regulating pH value, carrying out anaerobic regulation and aerobic regulation, carrying out flocculation, carrying out membrane separation concentration, and spray-drying so as to obtain a lignin finished product. According to the technology for extracting lignin from residues of pectin extraction from orange peel, the separating medium residue obtained after pectin extraction from orange peel is used as a raw material for extraction of lignin. Therefore, waste of resources is avoided, energy conservation and environment protection are achieved, and output value is increased.

Description

technical field [0001] The invention relates to the technical field of lignin extraction, in particular to a process for extracting lignin from the residue after extracting pectin from citrus peel. Background technique [0002] Whether citrus fruits are eaten fresh or processed, the peel is the main by-product. In addition to water, cellulose, and lignin, citrus peels are also rich in pigments and pectin. At present, when most enterprises use citrus peels to extract pectin, they perform water washing, acid water extraction, and liquid slag separation. The obtained slag is dried and crushed to obtain pectin. The separated separation liquid is directly discarded as waste, but the separation liquid It contains lignin, cellulose, etc., and it is directly discarded, which not only pollutes the environment but also wastes resources. Lignin has good dispersibility, flame retardancy, solvent resistance and thermal stability, and has high utilization value in modern industry. Cont...

Claims

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Application Information

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IPC IPC(8): C08H7/00
CPCC08H6/00
Inventor 谢保明
Owner ANHUI YUNING PECTIN CO LTD
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